require "cases/helper"
require 'models/topic'

class FinderRespondToTest < ActiveRecord::TestCase

  fixtures :topics

  def test_should_preserve_normal_respond_to_behaviour_on_base
    assert_respond_to ActiveRecord::Base, :new
    assert !ActiveRecord::Base.respond_to?(:find_by_something)
  end

  def test_should_preserve_normal_respond_to_behaviour_and_respond_to_newly_added_method
    class << Topic; self; end.send(:define_method, :method_added_for_finder_respond_to_test) { }
    assert_respond_to Topic, :method_added_for_finder_respond_to_test
  ensure
    class << Topic; self; end.send(:remove_method, :method_added_for_finder_respond_to_test)
  end

  def test_should_preserve_normal_respond_to_behaviour_and_respond_to_standard_object_method
    assert_respond_to Topic, :to_s
  end

  def test_should_respond_to_find_by_one_attribute_before_caching
    ensure_topic_method_is_not_cached(:find_by_title)
    assert_respond_to Topic, :find_by_title
  end

  def test_should_respond_to_find_by_with_bang
    ensure_topic_method_is_not_cached(:find_by_title!)
    assert_respond_to Topic, :find_by_title!
  end

  def test_should_respond_to_find_by_two_attributes
    ensure_topic_method_is_not_cached(:find_by_title_and_author_name)
    assert_respond_to Topic, :find_by_title_and_author_name
  end

  def test_should_respond_to_find_all_by_an_aliased_attribute
    ensure_topic_method_is_not_cached(:find_by_heading)
    assert_respond_to Topic, :find_by_heading
  end

  def test_should_not_respond_to_find_by_one_missing_attribute
    assert !Topic.respond_to?(:find_by_undertitle)
  end

  def test_should_not_respond_to_find_by_invalid_method_syntax
    assert !Topic.respond_to?(:fail_to_find_by_title)
    assert !Topic.respond_to?(:find_by_title?)
    assert !Topic.respond_to?(:fail_to_find_or_create_by_title)
    assert !Topic.respond_to?(:find_or_create_by_title?)
  end

  private

  def ensure_topic_method_is_not_cached(method_id)
    class << Topic; self; end.send(:remove_method, method_id) if Topic.public_methods.include? method_id
  end
end
